Add an executable runtime example assertion that merges two mutation ledgers containing different entity types with the same numeric ID and verifies that each type retains its own optimistic version.\n\nInvariant: identity is (entity type, ID), never ID alone.\n\nThis is the cross-runtime regression counterpart of teaql-rs#118.
Add an executable runtime example assertion that merges two mutation ledgers containing different entity types with the same numeric ID and verifies that each type retains its own optimistic version.\n\nInvariant: identity is (entity type, ID), never ID alone.\n\nThis is the cross-runtime regression counterpart of teaql-rs#118.